globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005204
Scopus记录号: 2-s2.0-84955181971
论文题名:
Multimolecular tracers of terrestrial carbon transfer across the pan-Arctic: 14C characteristics of sedimentary carbon components and their environmental controls
作者: Feng X; , Gustafsson Ö; , Holmes R; M; , Vonk J; E; , Van Dongen B; E; , Semiletov I; P; , Dudarev O; V; , Yunker M; B; , Macdonald R; W; , Wacker L; , Montluçon D; B; , Eglinton T; I
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:11
起始页码: 1855
结束页码: 1873
语种: 英语
英文关键词: compound-specific radiocarbon analysis ; diacids ; lignin ; pan-arctic rivers ; plant wax lipids ; terrestrial carbon markers
Scopus关键词: benchmarking ; carbon flux ; carbon isotope ; climate effect ; fluvial deposit ; lignin ; mobilization ; organic carbon ; permafrost ; radiocarbon dating ; runoff ; terrestrial environment ; tracer ; translocation ; Arctic ; Eurasia
英文摘要: Distinguishing the sources, ages, and fate of various terrestrial organic carbon (OC) pools mobilized from heterogeneous Arctic landscapes is key to assessing climatic impacts on the fluvial release of carbon from permafrost. Through molecular 14C measurements, including novel analyses of suberin- and/or cutin-derived diacids (DAs) and hydroxy fatty acids (FAs), we compared the radiocarbon characteristics of a comprehensive suite of terrestrial markers (including plant wax lipids, cutin, suberin, lignin, and hydroxy phenols) in the sedimentary particles from nine major arctic and subarctic rivers in order to establish a benchmark assessment of the mobilization patterns of terrestrial OC pools across the pan-Arctic. Terrestrial lipids, including suberin-derived longer-chain DAs (C24,26,28), plant wax FAs (C24,26,28), and n-alkanes (C27,29,31), incorporated significant inputs of aged carbon, presumably from deeper soil horizons. Mobilization and translocation of these "old" terrestrial carbon components was dependent on nonlinear processes associated with permafrost distributions. By contrast, shorter-chain (C16,18) DAs and lignin phenols (as well as hydroxy phenols in rivers outside eastern Eurasian Arctic) were much more enriched in 14C, suggesting incorporation of relatively young carbon supplied by runoff processes from recent vegetation debris and surface layers. Furthermore, the radiocarbon content of terrestrial markers is heavily influenced by specific OC sources and degradation status. Overall, multitracer molecular 14C analysis sheds new light on the mobilization of terrestrial OC from arctic watersheds. Our findings of distinct ages for various terrestrial carbon components may aid in elucidating fate of different terrestrial OC pools in the face of increasing arctic permafrost thaw. © 2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77910
Appears in Collections:气候变化事实与影响

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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China; Geological Institute, ETH Zürich, Zürich, Switzerland; Department of Environmental Science and Analytical Chemistry (ACES), Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Woods Hole Research Center, Falmouth, MA, United States; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Arctic Centre, University of Groningen, Groningen, Netherlands; School of Earth, Atmospheric and Environmental Sciences (SEAES), Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, United Kingdom; International Arctic Research Center (IARC), University of Alaska Fairbanks, Fairbanks, AK, United States; Pacific Oceanological Inst., Russian Academy of Sciences, Far Eastern Branch (FEBRAS), Vladivostok, Russian Federation; Institute of Natural Resource, National Research Tomsk Polytechnic University, Tomsk, Russian Federation; 7137 Wallace Dr., Brentwood Bay, BC, Canada; Department of Fisheries and Oceans, Institute of Ocean Sciences, Sidney, BC, Canada; Laboratory of Ion Beam Physics (LIP), ETH Zürich, Zürich, Switzerland; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States

Recommended Citation:
Feng X,, Gustafsson Ö,, Holmes R,et al. Multimolecular tracers of terrestrial carbon transfer across the pan-Arctic: 14C characteristics of sedimentary carbon components and their environmental controls[J]. Global Biogeochemical Cycles,2015-01-01,29(11)
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